Flaw in OpenShift Router Allows Sensitive Data Disclosure
CVE-2026-42965

7.7HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Openshift Container Platform 4
Vendor
CVE Published:
29 May 2026

What is CVE-2026-42965?

A security flaw has been identified in the OpenShift Router, where users with EndpointSlice write access can exploit the system. This vulnerability allows an attacker to create a service backed by an FQDN EndpointSlice that resolves to a cloud metadata endpoint. By doing so, it becomes possible for the router to proxy requests to this endpoint, potentially leading to the disclosure of sensitive instance credentials and metadata. This incident bypasses existing security measures designed to validate IP addresses, posing a significant risk to user data.

References

https://access.redhat.com/security/cve/CVE-2026-42965
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2483184
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Ricardo Pchevuzinske Katz (Red Hat).
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